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Related Experiment Videos

Cyanide-catalyzed cyclizations via aldimine coupling.

B Jesse E Reich1, Aaron K Justice, Brittany T Beckstead

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA.

The Journal of Organic Chemistry
|February 14, 2004
PubMed
Summary

Aldimine coupling (AIC) enables cyanide-catalyzed intramolecular cyclization of dialdimines. This reaction efficiently forms six-membered heterocycles, with oxidative variants yielding diimine structures.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Heterocyclic Chemistry

Background:

  • Aldimine coupling (AIC) is the nitrogen analog of the benzoin condensation.
  • Previous applications of AIC have not extensively explored cyclization reactions.
  • Cyanide catalysis offers a pathway for novel organic transformations.

Purpose of the Study:

  • To investigate the application of cyanide-catalyzed aldimine coupling (AIC) for intramolecular cyclization of dialdimines.
  • To explore the formation of six-membered heterocycles using this methodology.
  • To examine the influence of reaction conditions, including aerobic oxidation, on the cyclization products.

Main Methods:

  • Intramolecular cyclization of various dialdimines using sodium cyanide as a catalyst.

Related Experiment Videos

  • Reactions were conducted in solvents such as N,N-dimethylformamide, methanol, and under phase-transfer conditions (methylene chloride/water).
  • Aerobic conditions were employed to investigate oxidative cyclization pathways.

    • Main Results:

    • Facile intramolecular cyclization of dialdimines was achieved, yielding diverse six-membered heterocycles.
    • Oxidative cyclization under aerobic conditions successfully produced diimine heterocycles.
    • Rigid dialdimines that precluded cyclization underwent oligomerization instead.

    Conclusions:

    • Cyanide-catalyzed AIC is an effective method for the synthesis of six-membered heterocycles from dialdimines.
    • The reaction offers a route to both diimine heterocycles and their oxidized counterparts.
    • The study demonstrates the versatility of AIC in constructing complex heterocyclic scaffolds.